will these tires fit my surf??

Petemcc · Post by **Petemcc** » Thu Oct 20, 2005 1:23 pm

i have an 89 toyota surf and want to know if 285 75 x 16 will fit it?? it has 16 inch toyota rims ( they came out on the early prados it think) they only have 205 tires on them. anybody know?

DieselBoy · Post by **DieselBoy** » Thu Oct 20, 2005 1:56 pm

Yes they will fit.

MATT4U · Post by **MATT4U** » Thu Oct 20, 2005 1:59 pm

what are those sizes in inches?

DieselBoy · Post by **DieselBoy** » Thu Oct 20, 2005 2:09 pm

Its around the 31.5" mark from memory. Google it, there's loads of tyre size calculators, i just can't be assed at the mo.

What are the tyres??

SAT's??

MATT4U · Post by **MATT4U** » Thu Oct 20, 2005 2:36 pm

http://www.4lo.com/calc/gearmetric.htm

DieselBoy · Post by **DieselBoy** » Thu Oct 20, 2005 2:44 pm

Ok, 32.8, I was closeish :wink:

Anyhow i'm 90% sure thats what these are, just trying to confirm:

Edit; He says they are 750 16s so yep.

Petemcc · Post by **Petemcc** » Thu Oct 20, 2005 7:01 pm

cheers guys. how about the width on my rims? the tires are bfg all terrrains

Petemcc · Post by **Petemcc** » Thu Oct 20, 2005 7:38 pm

or how about 255 85

. would they make much difference on the open road? its an old shape surf by the way

NJV6 · Post by **NJV6** » Thu Oct 20, 2005 7:48 pm

Hi, a 255 x 85 measures slightly (slightly!) bigger than the 285 which also measures slightly bigger than the 33 inch tyre. In BFG sizing that is.

With the 285 being about 11.5 inches wide they may come close to rubbing if not rub in places depending on how the offset of the rims are. Going from a 29 inch tyre (205x16) up to a 33 inch will really really affect your gearing on the road. It will find hills you can't see.

Also the 16 inch curf rims are probably 6 inch and would be a bit iffy on a 285 tyre, even a 255.

tomsoffroad · Post by **tomsoffroad** » Thu Oct 20, 2005 9:34 pm

Might be stating the obvious here but this is how it works......

285/55/16 for example....
285 is the width of the tread in millimetres.
55 is a percentage of that tread width. Say 55%. Which is the height of the sidewall. 156.75mm
16 is the rim diametre in inches!!!! :roll:

So therefore 285/75/16 is within a couple of millimetres of a 33inch and is about 11.5inches wide.

Break out the tape measure bro :wink:

tomsoffroad · Post by **tomsoffroad** » Thu Oct 20, 2005 9:36 pm

With the 285 being about 11.5 inches wide they may come close to rubbing if not rub in places depending on how the offset of the rims are. Going from a 29 inch tyre (205x16) up to a 33 inch will really really affect your gearing on the road. It will find hills you can't see.

Ha should have read this before I opened my big mouth :oops:

MATT4U · Post by **MATT4U** » Fri Oct 21, 2005 6:10 am

285/75/16
Width/Profile/Rim

Petemcc · Post by **Petemcc** » Fri Oct 21, 2005 7:18 am

if i was to get new rims, what offset/backspace is allowable on my truck?? how exactly does this work?(incase you havnt realised im new to picking wheels and tires lol)

DieselBoy · Post by **DieselBoy** » Fri Oct 21, 2005 7:56 am

You can use what ever you like from what i can gather.

The only catch is that the tread on the tyres must be inside the gaurds or flares.

So if you have rims with a big offset, then yiou gotta have the flares to match.

Side walls can stick out the side of the flares or gaurds.

tomsoffroad · Post by **tomsoffroad** » Fri Oct 21, 2005 9:17 am

Check out http://www.lvvta.govt.nz might be .co.nz Cant remember. You'll find exactly what you need to know about the legal side of things.

tomsoffroad · Post by **tomsoffroad** » Fri Oct 21, 2005 9:20 am

Sh!t no thats not it anymore. Try this one..... http://www.lvvta.org.nz/newindex6.html#wheels

Its http://www.lvvta.org.nz

Petemcc · Post by **Petemcc** » Fri Oct 21, 2005 2:09 pm

what about the other way round? i was looking at buying sum rims of a guy who had bought them and the back space was to big to fit on his truck (i take it thats how far behind the hub they sit?) they back space on these are 110mm anybody know if a surf can cope with this?

DieselBoy · Post by **DieselBoy** » Fri Oct 21, 2005 3:21 pm

No, how far back the the hub sits from the center of the rim.

If you look at your entire wheel as two seperate parts its easyest.

You have the rim which your tyre sits on, and the center which is welded or bolted to the rim and mates up to you hub.

If you drew a line round the circumference of the rim in the dead center, and the center part of the wheel was perfectly flat and was welded on around that line, you would have zero off set or back spacing.

By moving the center of the rim inwards from the line you drew, to wards the inside or back of the wheel, you create off set.
As the axle is a fixed point, it makes the wheel stick out further towards the edge of the gaurd.

It means that the center point of the wheel which mounts to the hub is now off set or back spaced from the center point of the rim.

Hope that helps, it confusing as hell to try to explain!!!!

I don't know what the back spacing measurement you posted looks like on a surf, but i will post one of my old one when i get home and give you the spec's of the rims i was using.

They were the biggest you could go on a surf and they ripped my front mud flaps off.
They also neede flare's to be legal, but as if you would take it for a wof like that anyway :wink:

Stay tunned.........

DaveM · Post by **DaveM** » Fri Oct 21, 2005 4:28 pm

If you don't want to have to get the truck certified, then do not go over 25mm wider than the original spec track width.
In other words, the rims are allowed to stick out 12.5mm more than the originals (each side, measured centre of rim to centre of rim). If they do, you need a cert. regardless of whether the tyres are still within the guards or not.

The other side of things is, if you go up to the max allowable, but the tyres stick out past the guards, you need flares, which means you STILL need a LVC :roll:

You can get around this by swapping wheels at wof time, or go somewhere that won't pick up on these, but be warned that insurance companies will look for anything to get out of paying, and you will be opening a big can of worms if you are involved in a serious accident with "illegal" wheels/tyres.

Dave

muddy · Post by **muddy** » Sat Oct 22, 2005 6:47 am

Offset is the how far the mounting is from the centre of the rim, and backspaqe is the distance from the face of the hub (where you bolt it on) to the inside edge of the rim, so if you have 8in rims, a zero offset will have 4in backspace. 10in rims with zero offset wil have 5in backspace. lThe backspace is the critical measurement, because it needs to be the same, no matter what rims you get, otherwise you wind up with rims rubbing on steering knuckles or brake discs or tyres rubbing on the inside if the wheel-well. Also, if you get a bigger backspace, you will have a narrower track - not good if you're going higher with taller tyres! I think most toyotas (cruisers & hiluxes) have about 85-90mm backspace, and nissans are around 100-110mm, but don't rely on that. Best to measure the backspace on your factory rims & use that for your new ones. Less backspace is OK - it willmake your tyres sit wider so will help stability, but may cause certification problems if they sit too wide. I think that all makes sense???

Petemcc · Post by **Petemcc** » Sat Oct 22, 2005 8:30 am

thanks alot guys, think i got it sused now.
cheers Pete